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"""
Parse scheme, host and port from a string.
"""
import re
import typing
from typing import Tuple
from mitmproxy.net import check
class ServerSpec(typing.NamedTuple):
scheme: str
address: typing.Tuple[str, int]
server_spec_re = re.compile(
r"""
^
(?:(?P<scheme>\w+)://)? # scheme is optional
(?P<host>[^:/]+|\[.+\]) # hostname can be DNS name, IPv4, or IPv6 address.
(?::(?P<port>\d+))? # port is optional
/? # we allow a trailing backslash, but no path
$
""",
re.VERBOSE
)
def parse(server_spec: str) -> ServerSpec:
"""
Parses a server mode specification, e.g.:
- http://example.com/
- example.org
- example.com:443
Raises:
ValueError, if the server specification is invalid.
"""
m = server_spec_re.match(server_spec)
if not m:
raise ValueError("Invalid server specification: {}".format(server_spec))
# defaulting to https/port 443 may annoy some folks, but it's secure-by-default.
scheme = m.group("scheme") or "https"
if scheme not in ("http", "https"):
raise ValueError("Invalid server scheme: {}".format(scheme))
host = m.group("host")
# IPv6 brackets
if host.startswith("[") and host.endswith("]"):
host = host[1:-1]
if not check.is_valid_host(host.encode("idna")):
raise ValueError("Invalid hostname: {}".format(host))
if m.group("port"):
port = int(m.group("port"))
else:
port = {
"http": 80,
"https": 443
}[scheme]
if not check.is_valid_port(port):
raise ValueError("Invalid port: {}".format(port))
return ServerSpec(scheme, (host, port))
def parse_with_mode(mode: str) -> Tuple[str, ServerSpec]:
"""
Parse a proxy mode specification, which is usually just (reverse|upstream):server-spec
Returns:
A (mode, server_spec) tuple.
Raises:
ValueError, if the specification is invalid.
"""
mode, server_spec = mode.split(":", maxsplit=1)
return mode, parse(server_spec)
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